Jet apparatus.



W. DOBSON.

JET APPARATUS. APPLIOATION FILED JAN. 2, 1914,

Patented Mar. 24, 191i outrun sramns remand? curios.

WILLIAM DOBSON, OF ROXIBURY, MASSACHUSETTS, ASSIGNOR 530 UNITED INJECTOR COMPANY, OF NEW YORK, N. Y., A CORPORATIGN 01? NEW YORK.

J ET APPARATUS.

Specification of Letters Patent.

Patented Mar. 24, 1914.

To all whom it may concern:

Be it known that I, WILLIAM DOBSON, a citizen of the United States, and resident of Roxbury, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Jet Apparatus, of which the following is a specification.

My invention relates to jet apparatus and has for its object the provision of means for automatically discriminating between water and steam, so that the jet apparatus will deliver water under normal conditlons of operation but will close its delivery the instant that water is superseded by steam 1n its delivery passages.

An instance of the uses to WlllCll my invention may be applied is found in the coal sprinkling attachments used on locomotive engines. These have been usually attached to a delivery pipe of a boiler feedlng in ector so as to obtain water under pressure for coal sprinkling purposes. "This mode of mstallation leads to many accidents which are due primarily to the liability of such et apparatus to blow steam instead of water and to the high temperature of the water delivered through the hose from such a source.

In utilizing the discriminating attachment which is the characteristic feature of my 1nvention, I prefer to combine it with et apparatus other than the boiler feedlng ln ector, although such discrim1nat1ng devices may be used in combination with the n1- jector.

In the drawings hereto annexed which illustrate my invention, Figure l is a vertical cross section showing jet pump apparatus and the discriminating valve; Fig. 2 is a cross section on the line 22 of F1g. 1; and Fig. 3 is a cross section on the line 38 of Fig. l.

The apparatus shown in the drawlngs 18 adapted to be used for coal sprinkling and similar purposes on a locomotive engine and will therefore be described in that association. The jet pump apparatus marked B consists of an ejector of well known construction so that it need not be described in detail. This jet pump .is provided with steam supplying and water supplying means, steam entering through the connection A and passing the check valve A, an water entering through the connection C. The steam supply will be controlled by a valve (not shown) and the Water supply Wlll preferably connect with some part of the water supply passages which lead from the tender tank to the boiler feeding injector. The inlet C may therefore be connected with the suction at any convenient point, preferably on the injector side of the strainer.

Under favorable conditions, a simple jet pump apparatus will suffice to pump water from the supply through a suitable hose for coal sprinkling or other purposes, but should the boiler feeding injector break when such jet pump is in operation, it will blow live steam back through the suction passages and thence into the connection C, and therefore if no preventive devices were provided, would emerge into the engine cab, endangerlng its occupants. Or, if the tank water happens to have been heated to an unusually high temperature, as is often the case, the steam delivered to the jet pump B may sufflee to turn the incoming water into steam also, and therefore, blow steam through the sprinkler hose with similar unpleasant consequences. In order to guard against accidents of this character and at the same time to provide jet pumping apparatus which will deliver water whenever possible and desired, I have. contrived the discriminating valve devices illustrated in the drawings.

Upon the jet pump casing there is mounted a valve casing E, in the instance shown cylindrical in form, and in the cylindrical interior of this casing the valve D is mounted to slide. This valve D has two seating faces, one, D cooperating with the seat 13 which surrounds the delivery aperture B adjacent to the jet pump B, the other, at D which cooperates. with the seat E' on the side away from the jet pump and controlling the passage E in the delivery conduit. The valve D is formed with longitudinal bearing surfaces D between which the valve is longitudinally cut away to provide through passages D between the valve and the casing E. The valve is moreover, cut away to form a neck 1) between the main body of the valve and the piston portion D through which a number of through apertures D are formed. A drip opening E is made in the side of the valve casing E at such a position that it is controlled by the piston portion D of the valve D.

The valve D is loaded 0 that it normally val rests against the seat B For the sake of simplicity, the loading of this valve is accomplished by giving the valve itself suflicient weightto overcome any'lifting tendency due to the flow of water from the pump B to the delivery end E The loading of the valve D is, however, such that it is not sufficient to resist the lifting tendency of expanding steam, should steam enter the valve casing E. The valve casing E and the valve D are larger in diameter than the aperture B so that between the valve and the jet pump there is provided an expansion chamber at E The through passages D and D are of such capacity that the lifting eflect of water flowing through them suflices to maintain the valve D lifted from the seat B without, however, carrying the valve to its extreme upward position where its end D will seat against the seat E formed in the union member E. In other words, the valve D is so designed and its apertures so proportioned that while water alone is passing from the jet pump to the delivery, the valve will float between the two seats B and E When the valve is thus floating the piston portion D will close the drip opening E When, however, the valve E is seated either against E or E this drip opening E* will be opened either to permit water to drain out of the valve chamber or to allow steam to escape from the expansion chamber E A drip opening is also formed at A and is controlled by the piston portion A attached to the check valve A, so that while the apparatus is in operation the drip opening A will be closed and will be reopened for draining purposes when the apparatus ceases to operate. This apparatus is intended to be mounted at such a level that normally water will rise and fill the spaces in which the jet pump B is located, so that upon the admission of steam through the supply end A, the flow of water will be set up, the pressure communicated by the water lifting the valve D from the seat B The through passages through the valve D, the weight of the valve E and the capacity of the jet pump B being as above indicated so adjusted and harmonized with the water-pressure will sufiice to hold the valve D floating between its upper and lower seats; the water delivery from E will be maintained so long as the proper and normal conditions subsist. If, however, for any reason the water column thus inmotion should break by turning to or being superseded by steam, the instant that steam enters the valve casing E it will expand in the expansion chamber E and provide enough additional lifting force to raise the valve D, overcoming the load thereon and seating the valve against the upper seat E automatically cutting off the 7 delivery through E. By this means the apparatus automatically discriminates between steam and water and guards against any undesirable consequences which might ensue from the delivery of steam alone or water mixed with steam through the hose or other pipe attached to the apparatus.

I claim:

1. The combination of .jet pump apparatus, steam and water supply means thereto, a delivery conduit therefrom, and a delivery control valve, provided with through passages, and a seating face on the side remote from the jet pump to cooperate with a seat to close the delivery conduit, and said seat.

2. The combination of jet pump apparatus, steam and water supply meansthereto, a delivery conduit therefrom, and a twofaced delivery control valve, one face seating toward and the other away from the jet pump, and through passages in the valve.

3. The combination of jet pump apparatus, steam and water supply means thereto, a delivery conduit therefrom,a delivery control valve and a casing therefor, said valve mounted to slide in the casing, pro:

vided with through passages and a seating.

face on the side remote from the jet pump, 7

to cooperate with a seat to close'the delivery conduit, and said casing having an expansion chamber between the valve and the jet pump. 7 r

4. The combination of jet pump apparatus, steam and water supply means thereto and a delivery conduit therefrom, a delivery control valve and easing therefor, said valve mounted to slide in the casing, provided with through passages, a seating face on theside away from the jet'pump, to close the delivery conduit, and a piston portion, said casing provided with a drip opening controlled by said piston portion of the valve. 7 i

5. The combination of jet pump apparatus, steam and water supply means thereto, and a delivery conduit therefrom, a delivery control valve and easing therefor,

said valve mounted to slide in the casing valve and having an expansion chamber between the valve and the jetpump. V

6. The combination of jet pump apparatus, steam and'water supply thereto, and a delivery conduit therefrom,'a two-faced delivery control valve having passages therethrough, a casing wherein said valve is mounted to slide, one face of the valve seating toward and the other away from the jet pump, a piston portion on said valve, and a drip opening in the casing controlled by said piston portion.

7. The combination of jet pump apparatus, steam and water supply thereto, and a delivery conduit therefrom, a two-faced delivery control valve having passages therethrough, a casing wherein said valve is mounted to slide, one face of the valve seating toward and the other away from the jet pump, a piston portion on said valve, and a drip opening in the casing controlled by said piston portion, said casing provided 10 Witnesses:

ODIN ROBERTS, FLORENCE A. COLLINS.

Gopiea of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C." 

